I think you may be undervaluing a Valyrian sword. In the Blackfyre rebellion, the fact that Daemon had Blackfyre, one of the ancient Targaryen blades, was a HUGE point in his favor in many people's eyes...they literally saw him having the House sword (did the Targ's have more than 2? Does any other House have more than 1?) as him being the rightful king. Tywin Lannister, one of the most powerful and the richest lords in Westeros, could not get his hands on a Valyrian sword. Small houses with nothing BUT a Valyrian weapon would not sell him one, no matter what he might have offered. One of his sons went on a crazy mission to find the ancient Lannister sword, Brightroar, and never returned. Jon Snow gets one handed to him. This doesn't strike you as...odd? Easy? I think Rockroi's post was spot on. Jon has many things handed to him and we cheer him for it. Take off the blinders, indeed.